The correct relationship  between free energy change in a reaction and the corresponding  equilibrium constant K_C is   

• A

  ${\mathrm{\Delta G}}^0={\mathrm{RTlnK}}_{\mathrm{c}}$

• B

  ${\mathrm{\Delta G}}^0=-{\mathrm{RTlnK}}_{\mathrm{c}}$

• C

  $\mathrm{\Delta G}={\mathrm{RTlnK}}_{\mathrm{c}}$

• D

  $\mathrm{\Delta G}=-{\mathrm{RTlnK}}_{\mathrm{c}}$